WebAssembly analyzer

[v1rtl]

Is your feature request related to a problem? Please describe.

Being able to analyze WebAssembly binaries

Describe the solution you'd like

Adding support for GOOS=js GOARCH=wasm, maybe wasip1 too?

Describe alternatives you've considered
None that I know off

Additional context
GitHub doesn't allow attaching wasm, but one of the specimens could gsa's WASM bundle that is used in the demo

[v1rtl]

another potential test subject, has a bunch of dependencies: https://bah5acgzat4nc4iztdqgeg7hi4ksl7sgv37rpb3rwb2epy5q5s7ublhmgorrq.bzz.limo/

[Zxilly]

An experimental implementation has been committed and you can check out the master version to try it out.
It seems that GitHub Actions is experiencing some problems right now, I'll wait until it's back up before releasing a new version.
v1.9.0 is ready

[v1rtl]

hell yeah it's working! thank you very much

[v1rtl]

Fails on latest:

gsa ./dist/bee.wasm
time=174.355µs level=INFO msg="Parsing binary..."
time=257.584898ms level=INFO msg="Parsed binary"
time=257.609182ms level=INFO msg="Finding build info..."
time=259.347656ms level=INFO msg="Found build info"
time=259.372279ms level=INFO msg="Loading packages..."
panic: runtime error: index out of range [18446744073709547520] with length 37679

goroutine 1 [running]:
github.com/Zxilly/go-size-analyzer/internal/wrapper.(*WasmWrapper).GetFunctionSize(...)
	/home/v1rtl/go/pkg/mod/github.com/!zxilly/go-size-analyzer@v1.10.1/internal/wrapper/wasm.go:31
github.com/Zxilly/go-size-analyzer/internal/knowninfo.(*Dependencies).AddFromPclntab.func1(0xddd720?)
	/home/v1rtl/go/pkg/mod/github.com/!zxilly/go-size-analyzer@v1.10.1/internal/knowninfo/dependencies.go:122 +0x66
github.com/Zxilly/go-size-analyzer/internal/entity.NewPackageWithGorePackage.func1(0xc00e321d80)
	/home/v1rtl/go/pkg/mod/github.com/!zxilly/go-size-analyzer@v1.10.1/internal/entity/package.go:84 +0x108
github.com/Zxilly/go-size-analyzer/internal/entity.NewPackageWithGorePackage(0xc00e2f45f0, {0xc00d3a7e40, 0x4}, {0xc89e72, 0x4}, 0xc0000bc1e0, 0xc000215af8, 0x1)
	/home/v1rtl/go/pkg/mod/github.com/!zxilly/go-size-analyzer@v1.10.1/internal/entity/package.go:94 +0x3b8
github.com/Zxilly/go-size-analyzer/internal/knowninfo.(*Dependencies).AddFromPclntab(0xc000012198, 0xc00e2f45f0, {0xc89e72, 0x4}, 0xc0000bc1e0, 0x1)
	/home/v1rtl/go/pkg/mod/github.com/!zxilly/go-size-analyzer@v1.10.1/internal/knowninfo/dependencies.go:125 +0x105
github.com/Zxilly/go-size-analyzer/internal/knowninfo.(*KnownInfo).LoadPackages(0xc0001ae000, 0xc00021a400, 0x1)
	/home/v1rtl/go/pkg/mod/github.com/!zxilly/go-size-analyzer@v1.10.1/internal/knowninfo/dependencies.go:159 +0x1b9
github.com/Zxilly/go-size-analyzer/internal/knowninfo.(*KnownInfo).LoadGoreInfo(0xc0001ae000, 0xc00021a400, 0x60?)
	/home/v1rtl/go/pkg/mod/github.com/!zxilly/go-size-analyzer@v1.10.1/internal/knowninfo/knowninfo.go:38 +0x25
github.com/Zxilly/go-size-analyzer/internal.Analyze({0xc00003ac90, 0x2a}, {0xdd04e0, 0xc000012348}, 0x458d8f3, {0xf5?, 0x85?, 0x45?, 0x0?})
	/home/v1rtl/go/pkg/mod/github.com/!zxilly/go-size-analyzer@v1.10.1/internal/analyze.go:78 +0x3da
main.entry()
	/home/v1rtl/go/pkg/mod/github.com/!zxilly/go-size-analyzer@v1.10.1/cmd/gsa/entry.go:62 +0x16e
main.main()
	/home/v1rtl/go/pkg/mod/github.com/!zxilly/go-size-analyzer@v1.10.1/cmd/gsa/main.go:8 +0x13

The WASM binary is ~70MiB

[Zxilly]

Did this error occur in previous versions? This version doesn't seem to have modified the Wasm-related logic, which is a bit confusing to me. Could you share the WASM file that triggered the error?

[Zxilly]

I got it. Go changed the storage method for the func index in pclntab since version 1.25. A fix is currently being developed.

[Zxilly]

Resolved in https://github.com/Zxilly/go-size-analyzer/releases/tag/v1.10.2

[v1rtl]

Confirmed to fix. Is it possible for gsa to surface more data? Half of the bundle here is unknown for instance:

[Zxilly]

I think it's possible, but I haven't had much free time lately. The top priority right now is support for Go 1.26.